A procedure inspired by the Tamm-Dancoff method is applied to the chiral
quark model which has been extended to include additional degrees of freedom: a
pseudoscalar isoscalar field as well as a triplet of scalar isovector fields.
The simpler, generic σ -- model has been used before as a test for the
Tamm-Dancoff inspired approximation (TDIA). The extended chirial quark model is
employed here to investigate possible novel effects of the additional degrees
of freedom as well as to point out the necessesity to introduce a SU(3)
flavour. Model predictions for the axial-vector coupling constant and for the
nucleon magnetic moment obtained in TDIA are compared with experimental values.Comment: 14 pages, LaTe
